This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

The final resting place of a free Black soldier who played a pivotal role in the Battle of Bunker Hill.

The oldest playground in America.

A steampunk wonderland that preserves America's history of industrial innovation.

Beautiful steampunk ghosts of early Massachusetts.

This supermarket is suspended 25 feet above an interstate highway.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

These impressively detailed battle scenes depict the violence and tragedy of war in miniature.

A historic bridge with a lovely acoustic anomaly.

This memorial garden is the final resting place of many beloved pets including that of a famous explorer.

The American author whose "rags-to-riches" stories were popular during the Gilded Age.

An elaborate, hidden model train in the Needham Town Forest.

A Nessie-like monster supposedly lurks in this lake.

This stunning home looks like it belongs in medieval Europe, not North Carolina.

After decades of neglect, a brutalist icon is getting new life as an eco-friendly hotel.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

The last remaining attraction from Paragon Park.

Commemorating the 1948 creation of the Jimmy Fund, a Boston-based cancer charity.

A memorial to Chinese freedom in the city where American freedom was born.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.